I'm still working on the exact subject matter of my talk, but it will most likely involve discussing the optimization challenges I faced while building the Quake 3 demo and things to consider when building a map or model format for use on the web. I'm also working on another surprise project that I want to be able to show off at the conference to contrast with the Quake Demo.
I'm extremely excited by this opportunity to mingle with the HTML5 game development community and share whatever I can about working in this exciting new environment! Hope to see you there!